Sink accessory



FIG. 1 is a top perspective view of a sink accessory, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front plan view thereof;

FIG. 6 is a rear plan view thereof;

FIG. 7 is a left side plan view thereof; and,

FIG. 8 is a right side plan view thereof. 

The ornamental design for a sink accessory, as shown. 